Welcome to the dark side. The ULTRA Black lens has the tint (VLT) cranked down to 6%, compared to industry standards of 11% - These lenses are DARKER and legally should not be used when operating a vehicle. On the other hand, these are the ultimate bright outdoor lens. Whether you are on the snow, sand, a white rooftop or just want the ultimate poolside shark lurking lens these are for you. We've taken Heat Wave's heritage design features and reimagined them with a race inspired, smooth profile and premium fit. The Quatro is a comfortable subframe that is covered by a striking single shield lens and completed with a contrasting metal brow accent. Our lenses are injection molded from thick 1.9mm shatter-resistant polycarbonate that is built to withstand Z87 Mass Impact Standards. Each pair of Quatro Z87 safety sunglasses is marked Z87 on the frame, arm and lens. Disclaimer: Removing arms, and or changing configuration in any way voids Z87 compliance. Lens Technology: 1.9mm thick Polycarbonate lens that meets or exceeds impact requirements for Z87 standards, injection molded to the highest standards and tested to ensure optimal clarity, along with color and light transmission standards. We use only the highest quality polarizing filters on our lenses for optimal glare reduction and supreme clarity *Available in both non-polarized and polarized options* Lenses are UV400 - 100% UVA / UVB blocking Ultra Black Lens VLT = 6% / Cat 4Ultra Black Polarized Lens VLT = 6% / Cat 4